PARTS OF A SEWING MACHINE AND THEIR
FUNCTIONS
hand-operated
sewing, treadle sewing machine or electric sewing
machine.
The basic parts of a sewing are listed below and seen in Fig.
1. Spool pin: It is
fitted on top of the arm to hold the reel.
2. Thread guide: It holds the thread in
position from the spool to
the needle.
3. Tension disc: The two concave discs put
together with the convex
sides
facing each other. The thread passes between the two. The
tension of
the thread is adjusted by a spring and nut which
increases or
decreases pressure
4. Take up lever: It is a lever fitted to
the body of the arm. Its up
and down
motion feeds the thread to the needle and tightens the
loop formed
by the shuttle.
5. Needle bar: This is a steel rod to hold
the needle at one end
with the
help of a clamp. Its main function is to give motion to
the needle.
6. Bobbin case: This moves into position
to catch the top thread
and form
the stitch as the needle is lowered into the bobbin
chamber.
7. Presser foot: It is fixed to the
presser bar to hold the cloth firmly
in position
when lowered.
8. Presser foot lifter: A lever attached
to the presser bar for raising
and
lowering the presser foot.
9. Stitch regulator: This controls the
length of the stitch.
10. Bobbin winder: A simple mechanism used
for winding thread
on the
bobbin.
11. Fly Wheel: When this is made to
revolve, it works the mechanism
of the
motion
12. Clutch or Thumb Screw: This is in the
center of the fly wheel
and it
engages and disengages the stitching mechanism.
13. Slide Plate: A rectangular plate,
which facilitates the removal
of the
bobbin case without lifting the machine.
14. Needle Plate or Throat Plate: A
semi-circular disc with a hole
to allow
the needle to pass through it.
15. Feed dog: This consists of a set of
teeth fitted below the needle
plate. It
helps to move the cloth forward while sewing.
16. Face plate: A cover which on removal
gives access to the oiling
points on
the needle bar, presser bar and take-up lever.
17. Spool pin for bobbin winding: Spool
of thread is placed on
this at the
time of bobbin winding.
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